That raises questions, as the 18-month cycle is relatively short for a software product. It happened something similar with Windows Phone 7, with smartphones that users could not upgrade to Windows Phone 8 . What happens in the case of Windows Phone 8? Then according Microsoft team responsible in a message on Twitter ,
One of the benefits of migrating to Windows Core is that Windows Phone 8 will be upgradeable.
In fact, in June 2012 also clarified that the problem existed with the previous generation of phones based on Windows Phone would not be repeated with Windows Phone 8 . It is rumored that Microsoft will offer three updates “under” the current operating system before the expiry date, and in fact, the first, codenamed Portico, is already underway.
But in addition to this project is the Windows Phone Blue , which many also call Windows Phone 9, which even could be announced later this year and to coincide with the launch of new handsets based mobile operating system for the holiday season.